Array substrate and preparation method thereof as well as touch display device

Abstract

This disclosure provides an array substrate and a preparation method thereof as well as a touch display device. The array substrate includes a substrate, a plurality of gate lines and a plurality of data lines on the substrate. The plurality of gate lines extend along a first direction and are arranged in a second direction different from the first direction, the plurality of data lines extend in the second direction and are arranged in the first direction, the plurality of gate lines intersect with the plurality of data lines to define a plurality of pixel areas. A plurality of touch signal lines are on the substrate and includes a lower touch signal line and an upper touch signal line, and an edge of the upper touch signal line is spaced apart from an edge of the lower touch signal line in the first direction.

1 . An array substrate, comprising:
 a substrate;   a plurality of gate lines and a plurality of data lines positioned on the substrate, wherein the plurality of gate lines extend along a first direction and are arranged in a second direction different from the first direction, the plurality of data lines extend in the second direction and are arranged in the first direction, the plurality of gate lines intersect with the plurality of data lines to define a plurality of pixel areas; and   a plurality of touch signal lines positioned on the substrate, wherein the plurality of touch signal lines extend in the second direction, each of the plurality of touch signal lines comprises a lower touch signal line and an upper touch signal line, the lower touch signal line is positioned in a same layer as the plurality of data lines, the upper touch signal line is positioned above the lower touch signal line in a direction perpendicular to the array substrate, and the upper touch signal line and the lower touch signal line are electrically connected to each other,   wherein a projection of the lower touch signal line on the substrate at least partially overlaps with a projection of the upper touch signal line on the substrate.   
     
     
         2 . The array substrate according to  claim 1 , wherein each touch signal line of the plurality of touch signal lines is adjacent to one of the plurality of data lines, the lower touch signal line comprises a first lower edge and a second lower edge extending along the second direction, a distance from the first lower edge to the adjacent data line in the first direction is less than a distance from the second lower edge to the adjacent data line in the first direction,
 wherein the upper touch signal line comprises a first upper edge and a second upper edge extending along the second direction, a distance from the first upper edge to the adjacent data line in the first direction is less than a distance from the second upper edge to the adjacent data line in the first direction,   wherein a projection of the first lower edge on the substrate and a projection of the first upper edge on the substrate do not overlap, or   a projection of the second lower edge on the substrate and a projection of the second upper edge on the substrate do not overlap.   
     
     
         3 . The array substrate according to  claim 1 , wherein a distance between two adjacent data lines between which a touch signal line of the plurality of touch signal lines is arranged in the first direction is a first distance,
 wherein a distance between two adjacent data lines between which no touch signal line is arranged in the first direction is a second distance, and   wherein the first distance is greater than the second distance.   
     
     
         4 . The array substrate according to  claim 3 , wherein one of the two adjacent data lines between which the touch signal line is arranged is an adjacent data line for the touch signal line, and the other of the two adjacent data lines between which the touch signal line is arranged is a non-adjacent data line for the touch signal line, and
 wherein a distance between the non-adjacent data line and the touch signal line in the first direction is a third distance, and the third distance is greater than the second distance.   
     
     
         5 . The array substrate according to  claim 4 , further comprising:
 a plurality of pixel electrodes arranged in the plurality of pixel areas respectively,   wherein one of the plurality of pixel electrodes is arranged between the non-adjacent data line and the touch signal line in the first direction,   wherein a distance between the non-adjacent data line and the pixel electrode arranged between the non-adjacent data line and the touch signal line in the first direction is a fourth distance,   wherein a distance between the touch signal line and the pixel electrode arranged between the non-adjacent data line and the touch signal line in the first direction is a fifth distance, and   wherein the fifth distance is greater than the fourth distance.   
     
     
         6 . The array substrate according to  claim 5 , wherein a width of the plurality of pixel electrodes in the first direction is essentially same. 
     
     
         7 . The array substrate according to  claim 1 , wherein a width of the plurality of data lines in the first direction is essentially same. 
     
     
         8 . The array substrate according to  claim 1 , further comprising:
 a common electrode,   wherein the lower touch signal line of at least one of the plurality of touch signal lines comprises a metal platform extended in the first direction, a projection of the common electrode on the substrate covers a projection of the metal platform of the lower touch signal line, and a via hole is formed to connect the metal platform of the lower touch signal line and the common electrode.   
     
     
         9 . The array substrate according to  claim 1 , further comprising:
 a common electrode,   wherein the upper touch signal line of at least one of the plurality of touch signal lines comprises a metal platform extended in the first direction, a projection of the common electrode on the substrate covers a projection of the metal platform of the upper touch signal line, and a via hole is formed to connect the metal platform of the upper touch signal line and the common electrode.   
     
     
         10 . The array substrate according to  claim 1 , wherein a width of the upper touch signal line in the first direction is essentially same as a width of the lower touch signal line in the first direction. 
     
     
         11 . The array substrate according to  claim 1 , wherein a width of the upper touch signal line in the first direction is greater than a width of the lower touch signal line in the first direction. 
     
     
         12 . The array substrate according to  claim 1 , further comprising:
 a first overlapping electrode,   wherein the upper touch signal line and the lower touch signal line of each of the plurality of touch signal lines are electrically connected to each other via the first overlapping electrode.   
     
     
         13 . The array substrate according to  claim 12 , wherein the array substrate comprises a display area and a non-display area adjacent to each other, and an upper via hole connected to the upper touch signal line and a lower via hole connected to the lower touch signal line are formed at positions of the non-display area close to the display area, and
 wherein the first overlapping electrode is electrically connected to the upper touch signal line and the lower touch signal line via the upper via hole and the lower via hole, so that the upper touch signal line and the lower touch signal line are electrically connected to each other.   
     
     
         14 . The array substrate according to  claim 13 , wherein the upper via hole and the lower via hole are aligned in the first direction. 
     
     
         15 . The array substrate according to  claim 13 , wherein the plurality of touch signal lines comprise valid touch signal lines and dummy touch signal lines, and the dummy touch signal lines are electrically connected to a common signal line via the first overlapping electrode. 
     
     
         16 . The array substrate according to  claim 15 , further comprising:
 a plurality of touch electrodes,   wherein the first overlapping electrode, the plurality of touch electrodes and the common signal line are arranged in a same layer, and each of the valid touch signal lines is electrically connected to one of the plurality of touch electrodes respectively in the display area.   
     
     
         17 . The array substrate according to  claim 13 , wherein a plurality of touch signal leads, a plurality of upper source signal leads and a plurality of lower source signal leads are arranged in the non-display area, and the plurality of data lines comprise a plurality of first data lines and a plurality of second data lines,
 wherein the plurality of touch signal leads are arranged in a same layer as the upper touch signal lines of the plurality of touch signal lines, and are respectively connected and extended with the upper touch signal lines of the plurality of touch signal lines,   wherein the plurality of upper source signal leads are arranged in a same layer as the lower touch signal lines of the plurality of touch signal lines, and are respectively connected and extended with the plurality of first data lines, and   wherein the plurality of lower source signal leads are positioned below the plurality of upper source signal leads in a direction perpendicular to the array substrate, and each of the plurality of lower source signal leads is electrically connected to one of the plurality of second data lines.   
     
     
         18 . The array substrate according to  claim 17 , wherein the plurality of second data lines form, at positions of the non-display area close to the display area, a data line via hole connected to a second data line of the plurality of second data lines and a source line via hole connected to the lower source signal lead, and
 wherein each of the plurality of lower source signal leads is electrically connected to one of the plurality of second data lines respectively via the source line via hole, a second overlapping electrode and the data line via hole, wherein the first overlapping electrode and the second overlapping electrode are arranged in a same layer.   
     
     
         19 . A touch display device, comprising an array substrate according to  claim 1  and an opposite substrate opposite to the array substrate. 
     
     
         20 . The touch display device according to  claim 19 , wherein a width of the upper touch signal line in the first direction is essentially same as or greater than a width of the lower touch signal line in the first direction.